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Anomalous electronic structure and pseudogap effects in Nd_1.85Ce_0.15CuO_4

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arxiv cond-mat/0107244 v1 pith:QCA56RKN submitted 2001-07-12 cond-mat.supr-con cond-mat.str-el

N.P. Armitage , D.H. Lu , C. Kim , A. Damascelli , K.M. Shen , F. Ronning , D.L. Feng , P. Bogdanov
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Z.-X. Shen (Stanford University) Y. Onose Y. Taguchi Y. Tokura (University of Tokyo) P.K. Mang N. Kaneko M. Greven (Stanford University)
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classification cond-mat.supr-concond-mat.str-el
keywords pseudogapferminearp-typesurfacealongangle-resolvedanomalous
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We report a high-resolution angle-resolved photoemission spectroscopic (ARPES) study of the electron-doped (n-type) cuprate superconductor Nd_1.85Ce_0.15CuO_4. We observe regions along the Fermi surface where the near-E_F intensity is suppressed and the spectral features are broad in a manner reminiscent of the high-energy ``pseudogap'' in the underdoped p-type (hole doped) cuprates. However, instead of occurring near the (pi, 0) region, as in the p-type materials, this pseudogap falls near the intersection of the underlying Fermi surface with the antiferromagnetic Brillouin zone boundary.

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